Oh, well, I got the luck of having, probably, the same rom as you so I got it working, and I have to say that the game is great.
First, I have to congratulate you for your mapping skills. Except for one route, it's impossible to tell which route you were using, and that's a really good point.
Second, the graphics are really good for the crappy base that is Ruby. Anyways, that's the part I care less about, but it's great anyways.
The plot is really intriguing, and the scripting is great. I specially loved the part when that guy disapperars and a item appears without having to fade out the screen. Great.
And finally, the strongest part, the dialogues. They are really fun. The "nuevodos" part was really fun, the dialogues with the police are genious, and the out-game refernces (or four wall breakage) alwys make me laugh. Great work with that (despite the fact of "deBer" being written with b instead of v, but...)
And, to end this post, I found three errors:
-When in the flower shop, you can end up into one of the girls:
-Graphic glitch when you exit a shop:
-And, it's raining in the building which leads to Ciudad Usura >_>